Radial plunger pump



June 23, 1936. H.- F. MacMlLLIN 2,

RADIAL PLUNGER PUMP Filed Feb 1, 1933 "s Sheets-Sheet 1 m INVENTQOR ,l mmp KMcM/tL/IV ATTORNEY H. F." MacMlLLlN ,0 5,330

RADIAL PLUNGER PUMP June 23, 1936.

Filed Feb. 1, 1953 5 Sheets-Sheet ,2

June 23, 1936. HHF'. M QMILLIN 2,045,330

' RAD-IA; PLUNGER PUMP v Fild Feb; 1', 1933 s Sheets-Sheet s g, I "S A TTORNE Y5 Patented June 23, 1936 UNITED STATES RADIAL PLUNGER PUMP Howard F. MacMillin, Mount by mesne assignments,

signor, iic Press Corporation Gilead, Ohio, asto The Hydrau- Inc., Wilmington, Deb, a

corporation of Delaware v Application February 1, 1933, Serial No. 654,691

4 Claims.

I My invention relates to pumps and in particular to radial plunger pumps. 4

It is the object of my invention to provide a radial plunger pump having cylindrical plungers or pistons operating at an angle to one another, preferably right angles. In particular it is my object to provide for the actuation of the pump piston or plunger in such a manner that it cannot rock, turn or twist within its cylinder; and to provide means such as a square cross-head block engaging with a flat base or piston and maintained in a constant engagemerit therewith so that the thrust on the piston is uniform throughout its diameter in order to prevent the rocking, turning and twisting of the piston within the cylinder. r

It is a further object to provide in this combination a rotary cylinder which moves the crosshead block and piston with it while they reciprocate with respect to the cylinder, at the same time rotating bodily with it.

It is a further object of my invention to provide a pump in which the suction andthe area of the fluid on which the suction is operated, progressively increase together.

It is a further object to provide means of progressively increasing the pressure of the given charge while bodily transporting it and progressively releasing the compressed charge, as the pressure on the charge is increased so that the maximum movement of the piston is at the time where there is a maximum space for the discharge of the fluid so compressed.

ill

It is a further object to provide a pump which' may be varied as to its stroke and reversed; and such variation and stroke may be effected while the pump is running.

It is a further object to provide for the support of the rotor bodily carrying the cylinders at spaced points.

Referring to the drawings, Figure 1 is a plan view of the pump.

Figure 2 is a side elevation thereof. v

Figure 3 is a section on the line 3-3 of Fig} ure 2.

Figure 4 is a section on the line 4-4 of Figure Figure 5 is a perspective of the eccentric shaft.

Figure 6 is a perspective of one ofthe thrust w shoes.

hFigure 7 'is a perspective of the other thrust s cc.

Figure 8 is a section on the line 3-3 of Figure 3 showing a modified construction.

Figure 9 is a section on the line 33 of Figure 8.

Referring to the drawings in detail, I is a am;- ing shaft driven from a suitable source of power and is provided with a shoulder 2. Theinner ball race carrs'lnt the balls 4 engages with the outer The outer end of this rotor it is mounted uponthe ball bearing I8 which in turn-is supported I upon the stationary shaft iii. The inner race of the ball bearing ii abuts with the removable casing head 20, which is retained on the main casing l by the bolts 2!.

The stationary member i9 carries an eccentrically disposed shaft member 22. The axis A-A of this shaft member 22 is eccentric to the major longitudinal axis of the pump 3-3, which is the axis of the shaft 8 and of the shaft i9 and also the axis of the rotor l5.

Mounted upon this eccentric member 22 is a square cross-head block 23 which rotates thereon. This block is caused to rotate by reason of the fact that the cylindrical pistons 24 have their inner flat ends 25 resting upon the flat thrust shoes 26, which in turn have their flat surfaces 21 resting upon the flat surfaces 28 of the crosshead block 23. As the rotor l5 rotates, it carries with it the pistons 24, the thrust shoes 26 and the cross head block 23, and due to the eccentric centric shaft 22, these pistons are caused to reciprocate within the cylinders l6 of the rotor lii' while the rotor and the pistons with the cross head block bodilyrotate about the axis 3-3. The cross-head block 23 moves laterally of the pistons.

It will be observed that the shaft I9 is stationary, but by changing the axis A-A of the eccentric projection 22 with regard to the axis 3-3 the relative position of the eccentricity of the axis A--A of the projection 22 may be varied, with the consequence that the degree of throw of the pumps and the direction of the pump may be controlled. The pump may be run in either direction.

It will be noted that this rotor I5 is cylindrical but the chamber in which it operates in the casings 'l and 20 is enlarged-to form valve slot passageways 29 and 30, being respectively the intake and discharge passageways for suction and discharge. The inner wall 3| progressively diverges from the surface 32 of the rotor l5 while the wall 33 progressively converges towards the surface 32 of the rotor l5.

As the piston 24 passes Opposite to the slot 29, it is being moved inwardly to draw the fluid mounting of the cross-head block 23 on the ec-' pump, and as the piston continues in its movement, it will trap the fluid in the cylinder l6 as the end of that cylinder is covered by the side wall of the casing with the result that the entrapped fluid is placed under compression as the slot is approached and then progressively released as the compression continues due to the expanding area It between the inner wall ofthe varying the eccentric position of the member 22 without rotation by rotating the screw and actuating the square end of the shaft I 9.

In the form shown in Eigures 8 and 9 instead of a stationary shaft I! there is provided a rectangular block i9a located in and adapted to move in a slot 34 formed in the head 20. In this head and extending from the slot 34 are two aligned holes 35, one at each edge of the slot. Extending into these holes and moving therein are pins 36, threaded'into the block No. One of the holes 35 is provided with an enlargement 3! to receive one end of a key 38, which has thereon a head 39 engaged by a ring 40 threaded into the enlargement 31 for holding the-key against longitudinal movement, but permitting a rotary movement thereof.

Into this key is threaded at 4| one end of one of the pins 36 so that a rotation of the key 38 will cause a longitudinal movement of the pin 36 engaging the key and. a corresponding movement of the other key and the block Isa in the slot 3|. The movement of the block which supports the eccentrically disposed shaft 22 causes an adjustment of the eccentric shaft with relation to the pistons 24, thereby varying the extent of movement of the pistons.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a pump, the combination of a rotor,

' means for driving the rotor, said rotor having oppositely-disposed cylinders, a separate piston in each cylinder, each-piston having a reduced portion at one end, amecCQlltl'lG stator, a square 2,045,880 into the cylinder it on the suction side oi the crosshead on said stator engaging said pistons while rotating on the stator, and a shoe interposed between the unreduced portions of said pistons and the surface of said square crosshead and arranged to interconnect said oppositelydisposed separate pistons, the reduced portions of the pistons engaging the crosshead block and the unreduced portions abutting th shoe.-

2. In a pump, the combinatio of a rotor, means for driving the rotor, said otor having cylinders, a separate piston in each cy der, each piston havingja reduced portion at one end, an eccentric stator, asquare crosshead on said stator engaging said piston while rotating on the stator, and a shoe'interposed between the unreduced portions of said pistons and the surface of said square crosshead and arranged to interconnect said oppositely-disposed separate pistons, said crosshead shoe and the ends of said pistons having flat surfaces for equal application of thrust.

3. In combination in a pump, a casing, a rotor having a plurality of oppositely-disposed cy1inders, a stator eccentrically disposed with respect to said rotor, a square crosshead block rotat-' ably mounted on said eccentric stator, a separate piston in each cylinder, each piston having a reduced portion at one end and a U-shaped thrust shoe having a bore in each lateral arm for receiving said reduced end portion and arrangedto interconnect said oppositely-disposed separate pistons and engage said crosshead block, the

reduced portions of the pistons engaging the crosshead block and the unreduced portions abutting the shoe.

4. In combination in a pump, a casing, a rotor having a plurality of oppositely-disposed cylinders, a stator eccentrically disposed with respect to said rotor, a square crosshead block rotatably mounted on said eccentric stator, a separate piston in each cylinder, each piston having a reduced portion at one end and a U-shaped thrust shoe having a bore in each lateral arm for receiving said reduced end portion and forming a 

